How to Pronounce "eon"
word
Definition
An eon is an extremely long period of time, often used to describe millions or billions of years, especially in science or geology. It can also be used informally to mean 'a very long time.'
Listen in Context
The dinosaurs lived millions of years ago, in a different eon.
Geologists study changes that happen over an eon.
An eon is much longer than a century or a millennium.
It feels like an eon since we last talked.